Q = 6.00 kJ
given that the heat capacity of the final solution is the same as that of pure water of equal mass.
ΔH = 468 kJ/mol.
Both answers come with three sig. fig. as in data in the question.
Explanation(1)Final mass of the solution:
[tex]m = \text{Mass of Solution} = \text{Mass of Solute} + \text{Mass of Solvent} = 51.55 + 5.12 = 56.67\;\text{g}[/tex].
An increase in temperature by one degree celsius is the same as an increase in temperature by one degree Kelvin. Change in temperature:
[tex]\Delta T = \text{Final Temperature} - \text{Initial Temperature} = 49.8 - 24.5 = 25.3\;\text{K}[/tex].
Assume that the specific heat capacity of the NaOH solution is the same as the specific heat capacity of pure water:
[tex]c = 4.182\;\text{J}\cdot\text{g}^{-1}\cdot\text{K}^{-1}[/tex].
In other words, it takes 4.182 Joules of energy to raise the temperature of one gram of pure water by one degree Kelvin. Assume that so is the case for the NaOH solution.
Energy change:
[tex]Q = c\cdot m \cdot \Delta T = 4.182 \times 56.67 \times 25.3 = 5995.95\times 10^{3} \;\text{J} = 6.00\times 10^{3}\;\text{J}[/tex].
(2)Refer to a periodic table for relative atomic mass:
Na- 22.990;O- 15.999;H- 1.008.Formula mass of NaOH:
[tex]M(\text{NaOH}) = 22.990 + 15.999 + 1.008 = 39.997\;\text{g}\cdot\text{mol}^{-1}[/tex].
How many moles of formula units in that 5.12 gram of NaOH?
[tex]\displaystyle n = \frac{m}{M} = \frac{5.12}{39.997} = 0.128010\;\text{mol}[/tex].
ΔH measures the energy change per mole of NaOH dissolved. Dissolving 5.12 grams or 0.128010 moles of NaOH releases [tex]5.99595\times 10^{3} \;\text{J}[/tex] of energy.
[tex]\displaystyle \Delta H = \frac{Q}{n} = \frac{5.99595\times 10^{3}\;\text{J}}{0.128010\;\text{mol}} = 4.68\times 10^{5}\;\text{J}\cdot\text{mol}^{-1} = 4.68\times 10^{2}\;\text{kJ}\cdot\text{mol}^{-1}[/tex].
To calculate q of the solution, use q = m × c × ΔT. To find ΔH in kJ/mol for the reaction, use ΔH = q / n.
Explanation:To calculate q of the solution, we can use the equation: q = m × c × ΔT, where m is the mass of the water, c is the specific heat capacity of water, and ΔT is the change in temperature. The specific heat capacity of water is approximately 4.18 J/g°C. First, we need to calculate the mass of the water by subtracting the mass of NaOH from the total mass. Then, we can calculate q using the equation.
To find ΔH in kJ/mol for the reaction as it occurred in the calorimeter, we can use the equation: ΔH = q / n, where n is the number of moles of NaOH. First, we need to calculate the number of moles of NaOH by dividing the mass of NaOH by its molar mass. Then, we can calculate ΔH using the equation.
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What is the oxidation number of nitrogen in the nitrate ion NO31−?
+6
+5
+3
+2
In No3-1 the oxidation number of oxygen is -5 so oxidation number of N would be +5
Oxidation state on [tex]\text{N}[/tex] as in the nitrate ion [tex]{\text{NO}_3}^{-}[/tex]: +5.
ExplanationThe sum of oxidation states on all atoms in an ion should be the same as the charge of the ion.
The oxidation state of nitrogen N tends to vary. However, the oxidation state of oxygen O is -2 in most cases, with the following exceptions:
Oxidation state of O in [tex]\text{O}_2[/tex]: 0.Oxidation state of O in [tex]\text{H}_2\text{O}_2[/tex] and other peroxides: -1.The oxidation state of O will be positive when it is bonded to fluorine F.To find the oxidation state on N, consider the atoms in a nitrate ion:
There are three O atoms in each nitrate ion, as seen in the subscript "3".There's only one N atom in each nitrate ion.The oxidation state of each O atom is expected to be -2. There are three O atoms in each nitrate ion. The oxidation state of the three atoms will add up to [tex]3 \times (-2) = -6[/tex].
The oxidation state of the N atom needs to be found. Charge on the nitrate ion is -1. Thus
[tex]\begin{array}{ccc}\text{oxidation state on all atoms in the ion}&= &\text{charge of the ion}\\(\text{oxidation state on N}) + 3 \times (-2) &=& -1\end{array}[/tex]
[tex](\text{oxidation state on N}) = -1 - 3\times(-2) = -1 - (-6) = -1 + 6 = +5[/tex].
Therefore, the oxidation state of the nitrogen N atom in the nitrate ion [tex]{\text{NO}_3}^{-}[/tex] is +5.
Write the pressure equilibrium constant expression for this reaction. 2CO2 (g) + 4H2O (g) → 2CH3OH (l) + 3O2 (g)
Answer:
The pressure equilibrium constant (Kp) = (P O₂)³/(P CO₂)²(P H₂O)⁴.
Explanation:
For the reaction:2CO₂ (g) + 4H₂O (g) → 2CH₃OH (l) + 3O₂ (g).
The pressure equilibrium constant (Kp) = the product of the pressure of the products side components / the product of the pressure of the reactantss side components.
each one is raised to a power equal to its coefficient.
∴ The pressure equilibrium constant (Kp) = (P O₂)³/(P CO₂)²(P H₂O)⁴.
The pressure equilibrium constant expression for the reaction 2CO₂ (g) + 4H₂O (g) → 2CH₃OH (l) + 3O₂ (g) is Kp = (PO₂)³ / (PCO₂)²(PH₂O)⁴, considering only the gases involved, while excluding the liquid CH₃OH from the expression.
The pressure equilibrium constant expression for the reaction 2CO₂ (g) + 4H₂O (g) → 2CH₃OH (l) + 3O₂ (g) (g) involves including the partial pressures of gas-phase species and excluding the pure liquids and solids from the expression. According to the rules for writing equilibrium constant expressions, it is given by:
Kp = (PO₂)³ / (PCO₂)²(PH₂O)⁴
However, since CH₃OH is in the liquid phase, it does not appear in the equilibrium expression. Instead, we use the partial pressures of CO₂ and O₂, the gases present in the reaction.
The directional term that refers to an area or structure off to the side and away from the midline is __________.
.
Answer:
Lateral
Explanation:
Is the opposite side of the midline
Answer:
Lateral
Explanation:
Which of the following processes are endothermic? ice forming on a pond iodine crystals subliming water boiling gasoline burning
MULTIPLE ANSWERS
The boiling of water and sublimation of iodine crystals are endothermic processes.
Answer: Option B & C
Explanation:
Endothermic process are the classifications of chemical reactions where the heat is absorbed by the system from the surroundings. As the matters can exists in three phases like solid, liquid and gases.
The endothermic process occurs by absorption of heat energy by the system. So according to the given options, the boiling of water and iodine crystal sublimation follows endothermic process. In the boiling of water occurs when the water molecules absorb heat from the surrounding and convert to gas phase.
Similarly, the sublimation of iodine crystals also require heat energy from the surrounding to break the bonds of the iodine crystals to sublimate to gas phase. Thus the boiling of water and sublimation of iodine crystals are the examples of endothermic processes.
What happens to the mass of a substance during a physical change?
it stays exactly the same
Answer:
During a physical change, items may change, but the mass is the same.
how many moles of oxygen has will occupy a volume of 300ml at 2.7 atm and 40 degrees celsius
We can calculate the amount of Oxygen in this volume using the Ideal Gas Equation, PV = nRT, where "P" is the pressure, "V" is the volume, "n" is the number of moles of material, "R" is the gas constant, and "T" is the temperature in Kelvin. To properly answer this problem, all of the information needs to be converted into the proper units. Fortunately, everything except the volume and temperature is in the correct units for the Ideal Gas Equation; the volume can be adjusted by converting mL to L (x1000) and the temperature can be adjusted by adding 273.15 to the current temperature (conversion from Celsius to Kelvin).
Plugging in all the values, we find that:
PV = nRT
(2.7 atm)(0.3 L) = n(0.0821*)(313.15 K)
n = 0.0315 mol Oxygen
Under these conditions, 0.0315 moles of oxygen can be placed in this volume.
Hope this helps!
* - the units are liters times atmospheres divided by moles times Kelvin.
Thermodynamic PropertiesProperty Value
c (solid) 0.5 J/g °C
c (liquid) 1.0 J/g °C
c (gas) 2.0 J/g °C
Melting Point −114 °C
Boiling Point 78 °C
How much heat is released when 60.0 g of ethanol cools from 70 °C to 43 °C?
Answer:
1,620 J.
Explanation:
The amount of heat added to a substance (Q) can be calculated from the relation:Q = m.c.ΔT.
where, Q is the amount of heat released from ethanol cooling,
m is the mass of ethanol (m = 60.0 g),
c is the specific heat of ethanol in the liquid phase, since the T is cooled below the boiling point and above the melting point (c = 1.0 J/g °C),
ΔT is the temperature difference (final T - initial T) (ΔT = 43.0 °C – 70.0 °C = - 27.0 °C).
∴ Q = m.c.ΔT = (60.0 g)(1.0 J/g °C)(- 27.0 °C) = - 1620 J.
The system releases 1620 J.
Answer:
1,600 J
Explanation:
Obama said so
Why are fungi more closely related to animals than they are to plants?
A. animals and fungi are both autotrophs, while plants are heterotrophs
B. animals and fungi are both heterotrophs, while fungi are autotrophs
C. fungi and animals are both heterotrophs, while plants are autotrophs
D. fungi and plants are both autotrophs, while animals are heterotrophs
the answer maybe B or A
Final answer:
Fungi are more closely related to animals than plants because they are both heterotrophs, while plants are autotrophs. Fungi share characteristics such as being heterotrophic, having chitin in their cell walls, and storing carbohydrates as glycogen with animals.
Explanation:
Fungi are more closely related to animals than they are to plants because fungi and animals are both heterotrophs, while plants are autotrophs. Fungi obtain their energy by consuming complex organic compounds from outside sources, similar to animals. Fungi also share other characteristics with animals, such as having chitin in their cell walls and storing carbohydrates as glycogen.
Which process describes the movement of molecules from areas of high concentration to areas of low concentration? osmosis solution diffusion homeostasis
It is diffusion.
In a plant it is osmosis but thats not in an area
Solution has honestly got nothing to do with it.
The last one has to do with equilibrium
SO ITS DIFFUSION
:)
Answer: diffusion
Explanation:
Osmosis is defined as the process in which molecules of a solvent tend to move through a semipermeable membrane from a region of low concentration solution to a region of more concentrated solution in a membrane.
Solution is the homogeneous mixture of solute and solvent where solute is the component which is present in smaller proportion and solvent is the component which is present in larger proportion.
Diffusion is defined as the random motion of molecules from areas of higher concentration to lower concentration.
Homeostasis is the active regulation and maintenance of a stable internal physiological state in the face of a changing external environment.
How do bacteria help plants grow? I NEED HELP FAST IM TIMED!!!!!!!
Final answer:
Bacteria help plants grow by fixing nitrogen, decomposing organic matter, and improving soil fertility, in a mutualistic relationship where they also gain nutrients from plant photosynthates.
Explanation:
Bacteria play a crucial role in helping plants grow by engaging in a variety of symbiotic relationships and processes. One key interaction is the presence of nitrogen-fixing bacteria such as rhizobia, which live in nodules on the roots of legumes and convert atmospheric nitrogen into forms that plants can use as nutrients, effectively supplying plants with an endless supply of nitrogen. This process naturally fertilizes the soil, promoting plant growth. In addition to this, many species of bacteria decompose organic matter, releasing nutrients back into the soil, which plants can then absorb. Bacteria also benefit from this relationship by using photosynthates, which are substances produced during photosynthesis by the plants. This mutualistic relationship is critical for the soil’s fertility and the overall health of the ecosystem.
Why does every chemical reaction require a certain amount of activation energy? A. Energy is released when the reactants begin to react. B. Energy lost to the environment during the reaction must be replaced. C. Forming the activated complex requires energy. D. The products have more potential energy than the activated complex. E. The reactants have less potential energy than the products.
Answer: Option (C) is the correct answer.
Explanation:
Activation energy is defined as the minimum amount of energy required for a chemical reaction to start.
An activated complex is also known as transition state where bonds between the reactants are breaking and bonds between the products are forming.
For a chemical reaction, activation energy is required to result in the formation of activated complex.
Therefore, we can conclude that every chemical reaction require a certain amount of activation energy because forming the activated complex requires energy.
Answer:
c
Explanation:
i got it right on plato
A saturated solution can become supersaturated under which of the following conditions
the answer is d. when more solute is added
A gas occupies 72.1 at stp. At what temperature would the gas occupy 85.9 L at a pressure of 93.6 kPa?
Answer:
328.1 K.
Explanation:
To calculate the no. of moles of a gas, we can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in.
If n is constant, and have two different values of (P, V and T):P₁V₁T₂ = P₂V₂T₁
P₁ = 1.0 atm (standard P), V₁ = 72.1 L, T₁ = 25°C + 273 = 298 K (standard T).
P₂ = 93.6 kPa = 0.924 atm, V₂ = 85.9 L, T₂ = ??? K.
T₂ = P₂V₂T₁/P₁V₁ = (0.924 atm)(85.9 L)(298 K)/(1.0 atm)(72.1 L) = 328.1 K.
To solve for the temperature at which the gas occupies a given volume at a given pressure, we can use the ideal gas law equation PV = nRT.
Explanation:To solve this problem, we can use the ideal gas law equation: PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.
First, we need to find the number of moles of gas using the given information. Since the gas occupies 72.1 L at STP (standard temperature and pressure), we can use the molar volume of a gas at STP (22.4 L/mol) to calculate the number of moles: n = 72.1 L / 22.4 L/mol = 3.21 mol.
Next, we can rearrange the ideal gas law equation to solve for the temperature: T = PV / (nR). Plugging in the values we have, T = (93.6 kPa)(85.9 L) / (3.21 mol)(8.31 J/mol·K) = 277 K.
A neutron has a mass A. that is less than the mass of an electron. B. that is about equal to the mass of an electron. C. that is about equal to the mass of a proton. D. that is less than the mass of a proton.
A neutron has a mass that is about equal to the mass of a proton, approximately 1.0087 amu, while an electron has a much smaller mass of about 0.00055 amu.
Explanation:A neutron has a mass that is about equal to the mass of a proton. While the exact values can vary slightly due to isotopic differences, generally, a neutron is indeed slightly heavier than a proton, with a mass of approximately 1.0087 atomic mass units (amu), and a proton has a mass of approximately 1.0073 amu. In contrast, an electron is a much lighter particle with a mass of about 0.00055 amu. This significant difference in mass means that it would take about 1,836 electrons to equal the mass of one proton or neutron. The correct answer, therefore, is option C, that a neutron's mass is about equal to the mass of a proton.
Final answer:
A neutron has a mass that is C. about equal to the mass of a proton, not the mass of an electron. A neutron is slightly heavier than a proton and much heavier than an electron, with a weight of approximately 1.0087 amu. The correct answer is option C.
Explanation:
The mass of a neutron is about equal to the mass of a proton, which makes option C the correct answer. Specifically, a neutron has a mass of 1.0087 atomic mass units (amu) whereas a proton has a mass of 1.0073 amu. In comparison, an electron is a much lighter particle with a mass of approximately 0.00055 amu. Thus, it would take about 1800 electrons to equal the mass of one proton.
Additionally, in terms of charge, the neutron is electrically neutral with zero charge, the proton has a charge of 1+, and the electron has a charge of 1-. These subatomic particles are fundamental to the structure of atoms, with protons and neutrons making up the nucleus and electrons orbiting around it.
How are magic minerals different from Felsic minerals?
A. Mafic minerals contains lower levels of iron and magnesium.
B. Mafic minerals contain more dark-colored, high-density minerals
C. Mafic minerals contain more light-colored, low-density minerals.
D. Mafic minerals contain higher levels of feldspar and quartz
Answer:
Mafic minerals contain more dark-colored, high-density minerals.
Explanation:
Mefic and felsic minerals represent two kinds of minerals or lava.
For example, mefic lava is more viscous than felsic lava.
The other difference is that word mafic is related to presence of Magnesium and iron minerals more while in felsic (Feldspar) silica content is more.
Mefic minerals are associated with dark color while felsic are lighter in color.
Mafic minerals are dark-colored and high-density due to their higher iron and magnesium content, whereas felsic minerals are light-colored and low-density with higher silica content. The correct answer is B. Mafic minerals contain more dark-colored, high-density minerals.
The key difference between mafic and felsic minerals lies in their chemical composition and resulting physical properties. Mafic minerals are dark-colored and high-density minerals due to their higher iron (Fe) and magnesium (Mg) content and lower silica content. On the contrary, felsic minerals are typically light-colored and low-density, as they contain a higher concentration of silica in the form of quartz and orthoclase feldspar, and are lower in iron and magnesium.
Therefore, the correct answer to the student's question is: Mafic minerals contain more dark-colored, high-density minerals.
Mafic rocks like basalt and gabbro are primarily composed of minerals such as pyroxene and olivine, which contribute to the darker color and higher density, while felsic rocks such as granite and rhyolite are rich in quartz and potassium feldspar, giving them a lighter color and lower density.
a sample of CO2 occupies a volume of 280ml at a pressure of 1.3 atm and a temperature of 18 degrees celsius, what volume will the gas occupy at a temp of 35 degrees celsius and a pressure of 3.0 atm
We can calculate the new volume of the gas using the Combined Gas Law:
(P1 x V1) / T1 = (P2 x V2) / T2
The initial volume, pressure, and temperature were 280 mL, 1.3 atm, and 291.15 K (changing the temperature into Kelvin is necessary), and the final volume, pressure, and temperature is V2, 3.0 atm, and 308.15 K. Plugging these values in and solving, we find that:
(P1 x V1) / T1 = (P2 x V2) / T2
(1.3 atm x 280 mL) / 291.15 K = (3.0 atm x V2) / 308.15 K
V2 = 128.42 mL
This makes sense considering the conditions, a small increase in temperature would make the gas expand but a significant increase in the pressure would cause the volume to decrease.
Hope this helps!
What is the volume of 2.1 moles of Cl2 at stop?
= 47.04 L
Explanation;1 mole of a gas at s.t.p occupies a volume of 22.4 liters
Therefore;
2.1 moles of Cl2 will occupy;
2.1 moles × 22.4 L
= 47.04 L
what is located within 10 to 15 km above the earth's surface?
It extends 10 to 15 kilometers (6 to 10 miles) above the earth's surface depending on latitude and time of the year. The troposphere contains most of the atmosphere's water vapor.
The ozone layer is located 10-15 km above the earth's surface.
Describe the ozone layer.The ozone layer, also known as the ozonosphere, is an area of the upper atmosphere that is located between 15 and 35 km (9 and 22 miles) above the surface of the Earth containing a high concentration of ozone molecules (O₃). A fraction of the solar radiation is blocked from reaching the planet's surface by the ozone layer in the stratosphere. It mostly absorbs UVB radiation. Numerous negative consequences, including skin cancer, cataracts, damage to some crops, and harm to marine life have all been associated with UVB.Learn more about the ozone layer here:
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The ideal gas law measures volume in___.
For the Ideal Gas Law, pressure is measured in atmospheres, volume is measured in liters, and temperature is measured in Kelvin. Obviously, moles is measured in moles.
The ideal gas law measures volume in liters (L). The law also explores the relationship between pressure, volume, number of moles of the gas, and temperature. Hence, we can calculate the volume if we know the other three factors.
Explanation:The ideal gas law, usually written as PV = nRT, where 'P' represents pressure, 'V' volume, 'n' the number of moles of the gas, 'R' the ideal gas constant, and 'T' the temperature, measures volume in liters (L). According to Avogadro's Law, the volume of a gas at a constant temperature and pressure is proportional to the number of gas molecules. So in the ideal gas law, if we know the pressure, temperature, and the number of moles of a gas, we can calculate its volume.
For example, if we have a vessel with a known pressure and temperature, and we insert a known quantity of gas (in moles), we can use the ideal gas law to calculate the volume that the gas will occupy under those conditions.
Remember, this is for ideal gases. Actual gases may deviate from this law under certain conditions.
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science is a way of learning about the natural world that is based on what?
Learning how our body works and other things in the world work.
calorimeter containing 1000 grans of water the initial temperature of water is 24.85 degrees . the heat of water is 4.184 j/g degrees the heat capacity of the calorimeter is 695 j/ c after the reaction the final temperature of the water is 35.65
calculate the change of temperature
10.80 ° C
Explanation;From the information given;
Initial temperature of water = 24.85°C
Final temperature of water = 35.65°C
Mass of water = 1000 g
The specific heat of water ,c = 4.184 J/g °C.
The heat capacity of the calorimeter = 695 J/ °C
Change in temperature ΔT = 35.65°C - 24.85°C
= 10.80°C
When does a cold front develop? A. when two masses of warm air meet B. when a cold air mass invades a warm air mass C. when two masses of cold air meet D. when a warm air mass invades a cold air mass
Answer:b
Explanation:
Describe the atomic theory of atoms
Answer: Below
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Explanation:
The atomic theory is that all matter is made up of tiny units or particles called atoms. This theory describes the characteristics, structure and behavior of atoms as well as the components that make up atoms. Furthermore, the theory states that all elements are made up of identical atoms.
The atomic theory is a theory in the study of chemistry that states atoms are the building blocks of matter. Atoms contain protons, neutrons and electrons. Protons, which have a positive charge, and neutrons are found in the nucleus of the atom. Electrons, which have a negative charge, orbit the nucleus.
According to the atomic theory, all elements contain atoms. The difference is the number of protons, electrons and neutrons in that atom. For instance, hydrogen contains one proton and one electron but no neutrons. Oxygen, on the other hand contains eight protons, electrons and neutrons. The difference in protons, electrons and neutrons determines the stability and the other properties of any particular element. These elements are grouped according to their atomic masses, which depend on the number of protons and neutrons in each of the atoms. Because oxygen has more protons and neutrons than hydrogen, it has a higher atomic mass.
please help!! i need the answer ASAP!
Answer:
23.34 %.
Explanation:
The percentage of water must be calculated as a mass percent.We need to find the mass of water, and the total mass in one mole of the compound. For that we need to use the atomic masses of each element and take in consideration the number of atoms of each element in the formula unit.Atomic masses of the elements:Cd: 112.411 g/mol, N: 14.0067 g/mol, O: 15.999 g/mol, and H: 1.008 g/mol.
Mass of the formula unit:Cd(NO₃)₂•4H₂O
mass of the formula unit = (At. mass of Cd) + 2(At. mass of N) + 10(At. mass of O) + 8(At. mass of H) = (112.411 g/mol) + 2(14.0067 g/mol) + 10(15.999 g/mol) + 8(1.008 g/mol) = 308.5 g/mol.
Mass of water in the formula unit:mass of water = (4 × 2 × 1.008 g/mol) + (4 × 15.999 g/mol) = 72.0 g/mol.
So, the percent of water in the compound = [mass of water / mass of the formula unit] × 100 = [(72.0 g/mol)/(308.5 g/mol)] × 100 = 23.34 %how does hair an nails develop
According to google, "As keratin cells naturally push upward through the skin, they die and then harden, turning into your hair or nails."
Mark brainliest if you can! Thanks
Summarize facts about Chemical Change in 2-3 sentences.
A chemical change produces a new substance. When a chemical change takes place, electrons are either given away or received, that’s how you form a bond. Examples on how to identify a chemical change would be, if a gas is produced, precipitate, color change, temperature change. A chemical change can either be endothermic or exothermic.
How many atoms of carbon are in 0.00115 grams of carbon?
0.00115g x 12.01g/mol (molar mass of cabon) x 6.02 x 10^23 moles/atoms = 8.31x10^21
The atoms of carbon are in 0.00115 grams of carbon is 8.31 x 10²¹moles.
What is mole ?
The term mole is defined as the amount of substance in a system which include as many elementary entities as there are atoms present in it. It is denoted by the symbol “mol”. The word mole is coming from the Latin word moles, which means “a mass”.
The mole is also defined as it contain exactly 6.023 × 10²³ elementary entities present in it. 1 mole is exactly equal to the 6.023 × 10²³ elementary entities.
Molar mass of carbon = 12.01g/mol
1 mole = 6.02 x 10²³ moles/atoms
We have to calculate 0.00115 grams of carbon in an atom.
0.00115g x 12.01g/mol (molar mass of carbon) x 6.02 x 10²³ moles/atoms
=.31 x 10²¹mole.
Thus, The atoms of carbon are in 0.00115 grams of carbon is 8.31 x 10²¹moles.
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Two examples of energy transformations are shown.
The energy transformations are similar because they both involve transformations
that begin with chemical energy.
begin with electrical energy.
result in radiant energy.
result in mechanical energy.
The energy transformations are similar because they result into radiant energy.
As for the lamp, Electrical energy is transformed into light when the filament
or mercury vapor glows on passage of current.
The fire- chemical energy is turned to light energy during the combustion of carbon. Both products comprise of ultraviolet radiation which is a form of radiant energy.
Answer:
the answer is C
Explanation:
Soil erosion is a secondary environmental problem because it only degrades the land and does not affect water or air quality.
True or false ?
The correct answer is - False.
The soil erosion is a primary environment problem. It latter has effects that fall into the category of secondary environmental issues. The erosion of the soil is a very serious environmental issue, as it is the prime natural resources that enables the growth of plants, thus food for the living organisms, including the humans. Also, with high rates of erosion, the process of desertification significantly increases, as the soil is stripped of its top layers. The sediments that have been stripped of the soil can cause pollution of the air, though the stronger winds and storms that carry them, or with sediments getting to the water bodies and making them all murky, muddy.
17kg of aluminium was produced from 51kg of aluminium oxide (Al2O3) by electrolysis.What was the percentage yield?
Consider this reaction : 2Al2O3 → 4Al + 3O2
The number of moles of Al2O3 can be determined from its mass →
Number of moles of AL2O3 = mass/molar mass
=51/(27x2+16x3)
= 0.5 mol
Now, calculate aluminium's number of moles from the mole ratio →
Mole ratio 4(Al) : 2(Al2O3)
Number of moles of Al = (4/2) x0.5mol = 1 mol
Mass of Al = number of moles x molar mass
= 1x27
= 27kg (theoretical yield)
Given, actual yield = 17kg
Therefore, percentage yield = (actual yield / theoretical yield ) x 100
= (17/27)x100
= 62.96%